Articulated locomotive



April 9, 1929. J. cg. BLUNT ARTICULATED LOCOMOTIVE Filed Nov. 22, 1927 5Sheets-Sheet 1 ,.\\J N\J Q\M| Q W G C 0 Q n .4 o 9 o H I H.- I Q uHH PiorT April 9, 1929. J. G. BLUNT v 1,708,254

ARTICULATED LOCOMOTIVE Filed Nov. 22, 1927 5 Sheets-Sheet 2 Fl 6. s.-

I XI-i WITNESSES 5 Sheets-Sheet 3 J. G. BLUNT AHTICULATED LOCOMOTIVEFiled NOV. 22, 1927 l.h\l I l 1.. llllvlklllll April 9, 1929.

WITNES 30f April 9, 1929. J. G. BLUNT ARTICULATED LOCOMOTIVE 5Sheets-Sheet 4 rill/2% Z/l Vl/ Filed NOV. 22, 1927 I'TNESSES April 9,1929. J. G. BLUNT 1,708,254

ARTICULATED LOCOMOT IVE Filed Nov. 22, 1927 5 Sheets-Sheet 5 Qii-ue'ssas I V v ENTOR Patented Apr.

unrrsn stares JAMES G. BL'UN'l, OF SCI-IENECTA'DY, NEW YORK.

ARTIC'ULATED LOCOIVIOTIVE.

Application filed November 22, 1927.

This invention relates generally to locomotives of the articulated type,and its object is to provide means for supporting the front end of theboiler on the front main frame, with the capability of swivelling andlateral movements of the main frame, relatively to the boiler, whichmeans, while imposing a low yielding resistance to such relativelylateral movement, when the locomotive is traversing curved track, willpositively centre the main frame, by gravity, when the locomotive istraversing tangent track.

The invention is par-tie application in exceptionally heavy locomotives,where the load in'iposed on the boiler bearings is so great that theordinary type of spring operated centering device cannot e'llicientlyovereomethe friction between the section the same, taken at the centreof the frame; Fig. 5, a front end View, in elevation, of the mechanism;Fig. 6, a vertical transverse section, taken at the centre of themechanism; Fig. 7, a plan view of the geared roller guide; Fig. 8, aplan view of the mechanism, the boiler bearing saddle being shown insection, taken on the line A A of Fig. 4; and, Fig. 9, a plan view ofthe same, with the upper roller seats and the roller guide removed.

In the practice of the invention, referring descriptively to thespecific embodiment thereof which is herein exemplified, as applied to afour cylinder articulated locomouiarly adapted for Serial No. 234,950.

brackets, 16. Four lower roller seats, 17, are mounted onthe bed plate,each seat being provided with depending flanges, 18, which overlap thebed plate, to prevent longitudinal movementof the seats. Each rollerseat is forn'ied centrally with a rack, 19, which is inclined upwardly,on both sides of the central .verticalplane of the seat. Similarlyformed upper roller seats, 20, are mounted on a boiler bearing yoke, 21.Interposed between the members of each pair of upper and lower rollerseats, is a roller, 22, having gear teeth which mesh with the racks ofthe seats. Each roller is rotatively mounted on a pin, 23, and the pinsare mounted in a frame or guide, 24:. One end of each pin is made squareto lit a correspondingly shaped socket in the side walls of the guide.Cotter pins, 25, serve to lock the pins, 23, in place. The roller guideserves to maintain the rollers in fixed spaced relation, and flanges,26, formed on the side walls of the guide, and extending alongthe sidesof the roller seats, serve to hold the rollers on the seats. Each rollerseat is made indepoi'ident of the others, to permit the seats to beproperly adjusted to suit the centres of the rollers. When the properadjustment of the seats has been made, the seats are secured in place bydowel pins, 27, and suitable welding about their edges. The describedconstruction permits the necessary lateral movement of the front frame,relatively to the boiler, to accommodate the locomotive to curved track,and ensures the return of the frame, by gravity, to normal centralposition on tangent track.

To provide for the necessary swivelling movement of the front frame, theboiler hearing saddle, 28, is mounted on a plurality of alignedcylindrical rollers, 29, which are superposed on the bearing yoke, 21.The boiler bearing yoke is substantially of cross shape, and is providedwith four thrust blocks, two of which, 30, are disposed diametricallyopposite one another, in the longitudinal centralplane of the frontframe, and two of which, 30, are similarly disposed in a transverseplane of the frame. The thrust blocks are fitted in suitable channels inthe boiler bearing yoke, 21, and have thrust bearing surfaces, formedconcentric with the centre of the yoke. The thrust blocks, '30-", reston the wear surface, 31, of the bearing yoke, and are clamped in placeby the rec tangular cover plates, 32, which also serve as guides for thelong arms of a swivel yoke,

- when swivelling movement occurs.

33. The thrust blocks, 30,. are clamped in place in their channels, bythe upper and lower plates, 32, which also serve as guides for the shortarms of the swivel yoke.

- The swivel. yoke, 33, is cross shape, having two long arms, 33, andtwo short arms, 33". Each of the arms terminate in a thrust bearin'gsurface, having acurvature to match the opposed thrust block.

' The swivel yoke is formed open at the centre,.for the reception of theguide, 34, for the rollers, 29, which are rotatively mounted on pins,85, rotatively mounted in the guide. Therollers, 29, are each composedof a plurality of narrow cylinders, to prevent undesirable slippage, asthe outer ends of the rollers must travel farther than the inner ends,

To ensure the same distance of travel of the rollers, on the bearingsurface of the boiler bearing yoke andthe wear plate, 36, of the boilersaddle, a geared pinion, 37, is mountedion the outer end of each of thepins, 35. Each pinion meshes with a lower rack, 38, having a rectangularbase, which is fitted into a similarly shaped opening in the boilerbearing yoke; and an upper rack, 39, formed with a cylindricalextension, which fits into an onlarged opening in the boiler saddle.After the racks have been suitably ad usted, to suit the pinions, theyare welded in position. The

teeth'of the pinion and of the racks are developed so that the pinionmay revolve like and fitted in a similarly shaped opening in the boilerbearing yoke. A nut, 43, threaded on the lower end of the pin, servesto, secure it to the bearin yoke.

- llhe boiler bearing saddle is connected to the'swivelyoke,by twodepending box shape extensions, 44, which fit, with the capability oflongitudinal movement, in rectangular shaped openings, 45, formed in theswivel voke; The lower ends of the extensions pro- :iect belowthe boilerbearing yoke, and stops,

46, 111 the form of narrow cylinders, are bolted thereto, after theparts are assembled, Tl c cylinders serve as stops, to prevent abnormalseparation of the bearin yoke and l the saddle, thus ensuring themaintenance of the'pinions and racks in mesh.

To prevent the geared rollers from unmeshing from their racks, and tolimit transverse movement of the rollers, two safety yokes, 48, areprovided. The yokes are bolted to the transverse frame brace, one in thefront and one in the rear of the boiler bearingyoke, and each is formedwith an open ing, 49, the upper wall of which is provided with twoupwardly and oppositely inclined bearingsurfaces, 50. The boiler bearingyoke, 21, is provided, at its-front and rear, with a downward extension,51, having an end, 52, which projects through the opening, 4 9, in theyoke, and is adapted to bear on the inclined surfaces, 50, to preventthe separation of the upper and lower bearing seats for the gearedrollers. T be opening, 49, is made of a limited length, so that theextensions, 50,.when unusual lateral stresses are encountered, willstrike against its side walls, to prevent too great a degree of lateralmovement of the rollers.

The invention claimed as new and desired to be secured by'Letters Patentis:

1. In a locomotive, the combination of a plurality of main frames,articulated together; a boiler, rigidly mounted on one of the frames,and extending over another; and

means, on said secondmentioned frame, for supporting the boiler,comprising means adapted topermit lateral movementof the secondmentioned frame, relatively to the "boiler, when the locomotive istraversing curved track, and to return thesecond mentioned frame tonormal central position, by gravity, when the locomotive passes fromcurved to tangent track.

2. In a locomotive, the combination of a plurality of main frames,articulated together; a boiler, rigidly mounted on one of the frames,and extending over another; and means, on said second mentioned frame,for supporting the boiler, comprising a geared roller device adapted topermit lateral movement of the second mentioned frame, rela tively tothe boiler, when the locomotive is traversing curved track, and toreturn the second mentioned frame to normal central position, when the.locomotive passes from curved to tangent track.

3. In a locomotive, the combination of a plurality of main frames,articulated to gether; a boiler, rigidly mounted on one of the frames,and extending over another; and means, on said second mentioned frame,for supporting the boiler, comprising means, permitting swivellingmovement of the second mentioned frame, relatively to the boiler, andmeans, adapted to permit lateral movement of said second mentionedframe, relatively to the boiler, when the locomotive is traversingcurved track, and toreturn the second mentioned frame to normal centralposition, by gravity, when the locomotive passes from curved to tangenttrack;

4. In a locomotive, the combination of a plurality of main frames,articulated together; a boiler, rigidly mounted on one of the frames,and extending over another; and means, on said second mentioned frame,for supporting the boiler, comprising means, permentioned. frame,relatively to the boiler, and

' means, embodying geared rollers adapted to )ermitlateral movement. ofthe second mentioned frame relatively to the boiler when the locomotivetraversing curved track and to return-the seco d n'ientioned frame tonormal central po ion by gravity when the locomotive passes from curvedto tangent track.

5. In a locomotive the combination of a ,)lurality of main framesarticulated togetlier; a boiler rigidly mounted on one of the frames andextending over another; and

a means, on said second mentioned frame for supporting the boiler,comprising a plurality of geared rollers, each interposed between anupper and a lower roller seat, each seat embodying a rack, and each pairof seats be ing independent.

6. In a locomotive, the combination of a plurality of main frames,articulated to nether; a boiler, rigidly mounted on one of the frames,and extending over another; and n'ieans, on said second mentioned frame,for supporting the boiler, comprising a plurality of geared rollers,each interposed. between an upper and a lower roller seat, and a framefor holding the rollers in spaced relation, and causin them to rotate inunison.

'4'. In a locomotive, the combination of a plurality of main frames,articulated together; a boiler, rigidly mounted on one of the frames,and extending over another; and mom u said second mentioned frame, forsupporting the boiler, comp ing means for permitting swivellingmovements the second mentioned frai'ne, relatively to the boiler,embodying; a plurality of rollers, each composed of a plurality ofseparate cylindrical units, each unit being; adapted to rotateindependently of the others.

8. In a locomotive, the combination of a plurality of main frames,articulated t0- gether; a boiler, rigidly mounted on one of the frames,and extending over another; and means, on said second mentioned frame,for supporting the boiler, comprising means for permitting swivellingmovements of the second mentioned frame, relatively to the boiler,embodying a plurality of rollers, each composed of a plurality ofSeparate cylindrical units, each unit being; adapted to rotateindependently of the others, a guide frame, in which the rollers aremounted, and aswivel yoke, in which the guide frame is fitted.

f). In a locomotive, combination of a plurality of main frames, datedtogethe a boiler, rigidly mounted on one oi: the fran'ies, and extendingover another; and means, on said second mentioned frame, for supportingthe boiler, comprising a boiler saddle, a boiler bearing yoke, a swivelyoke, mounted for swivellin movement in said boiler bearing yoke, and aplurality of rollers,

fitted in the swivel yoke, and interposed between the boiler saddle andthe boiler bearing yoke.

10. In a locomotive, the cor bina'l'iou a plurality of main names, a,"-atcd Eogether; a boiler, llg'ltll moi s a one oi:

the frames and extending over means, on said second mentioned supportingthe boiler, compris saddle, a boiler bearing yoke, u n blocks mounted insaid yoke, a swivel yoke, having two arms extending transversely of thesecond mentioned frame, and two arms extending longitudinally thereieach of said arms being; adapted to transmit thrust to one of saidthrust blocks, and a plurality of rollers, mounted in said swivel yoke,and interposed between the boiler saddle and the boiler bearing yoke.

11. In a locomotive, the combination of a plurality of main frames,articulated together; a boiler, rigidly mounted on one of the frames,and extending over another; and means, on said second mentioned frame,for supporting the boiler, comprising a boiler bearing yoke, a swivelyoke, mounted on the boiler bearing yoke, a roller guide, mounted in theswivel yoke, rollers, mounted in the guide, a crosshcad, bolted to theboiler hearing yoke, and slidably litted in the roller guide, and. aboiler saddle mounted on the rollers.

12. In a locomotive, the con'ibination of a plurality of main frames,articulated together; a boiler, rigidly mounted on one of the frames,and extending over another; and means, on said second mentioned frame,for supporting the boiler, comprising a boiler bearing yoke, a swivelyoke, mounted on the boiler bearing yoke, a roller uide, mounted in theswivel yoke, a pair 0t pins, mounted in the guides, a roller, composedof a plurality of narrowcylindrical units, rotatively mounted on eachpin, a boiler saddle, mounted on the rollers, 21 bevel gear, mounted onthe outer end of each pin, an u per rack, at tached to the boilersaddle, and a lower rack, attached to the boiler bearing yoke, for eachbevel gear, and means, depending from the boiler saddle and slidablyfitted in the swivel yoke, for transmitting lateral thrusts of theboiler to the swivel yoke.

13. In a locomotive, the combination of a plurality of main frames,articulated together; a boiler, rigidly mounted on one of the frames,and extending over another; and means, on the second mentioned frame,for supporting the boiler, comprising a bed plat e, a boiler bearingyoke, mounted above the bed plate, a swivel yoke mounted above theboiler bearing yoke, a boiler saddle, mounted above the swivel yoke,lower roller seats, formed. with racks, mounted on the bed plate, upperroller seats, formed with racks, mounted on the boiler bearing yoke,rollers, interposed between the'seats, having gear teeth meshing Withthe racks thereof, and rollers, fitted 1n the swivel yoke, andinterposedbetween the boiler saddle and the boiler bearing yoke.

14L In a locomotive, the combination of a plurality of main frames,articulated together; aboiler, rigidly mounted on one of the frames, andextending over another; and means, on the second mentioned "frame for 10supporting the boiler, comprising a bed plate,

a boiler bearing yoke, a swivel-yoke, a boiler saddle, a geared rollerlateral motion device, interposed between the bed plate and the boilerbearing saddle, and rollers, fitted in the swivel yoke and interposedbetween the boiler saddle and the boiler bearing yoke, for facilitatingswivelling movements of the sec ond mentioned frame relatively to theboiler.

JAMES o. BLUNT

